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Antigen - Wikipedia, the free encyclopedia
An antigen (from antibody-generating) or immunogen [citation needed] is a substance that prompts the generation of antibodies and can cause an immune response. The word originated ...
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Antigen

Encyclopedia Article

Antigen, any substance that evokes the production of an antibody when introduced into the body of an animal. Antigens can enter the body through the respiratory tract, digestive tract, skin, or blood vessels. The most common antigens are proteins such as those found in bacteria and viruses. See also Allergy.